2505690 has 48 divisors (see below), whose sum is σ = 7109856. Its totient is φ = 607200.

The previous prime is 2505683. The next prime is 2505691. The reversal of 2505690 is 965052.

It is a super-2 number, since 2×2505690² = 12556964752200, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2505691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 276 + ... + 2255.

It is an arithmetic number, because the mean of its divisors is an integer number (148122).

2^2505690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2505690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3554928).

2505690 is an abundant number, since it is smaller than the sum of its proper divisors (4604166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2505690 is a wasteful number, since it uses less digits than its factorization.

2505690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555 (or 2552 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 2505690 is about 1582.9371434141. The cubic root of 2505690 is about 135.8237697191.

The spelling of 2505690 in words is "two million, five hundred five thousand, six hundred ninety".